Electric kettle



FIG. 1 is a front perspective view of an electric kettle, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings illustrate the portions of electric kettle, which form no part of the claimed design. 

CLAIM The ornamental design for an electric kettle, as shown and described. 